18506366679438 has 24 divisors (see below), whose sum is σ = 43742321242776. Its totient is φ = 5607989902800.

The previous prime is 18506366679401. The next prime is 18506366679487. The reversal of 18506366679438 is 83497666360581.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46733248993 + ... + 46733249388.

It is an arithmetic number, because the mean of its divisors is an integer number (1822596718449).

Almost surely, 2^{18506366679438} is an apocalyptic number.

18506366679438 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

18506366679438 is an abundant number, since it is smaller than the sum of its proper divisors (25235954563338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18506366679438 is a wasteful number, since it uses less digits than its factorization.

18506366679438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93466498400 (or 93466498397 counting only the distinct ones).

The product of its (nonzero) digits is 940584960, while the sum is 72.

The spelling of 18506366679438 in words is "eighteen trillion, five hundred six billion, three hundred sixty-six million, six hundred seventy-nine thousand, four hundred thirty-eight".